Telephonically-operated recording talking machine



. W. GROENEBAUM TELEPHONICALLY OPERATED. RECORDING TALKING. MACHINE Filed Oct. '17, 1924 m WM Maw

v Attorn ys Patented Aug. 18 1925. I

UNITED STATES v A 1 ,550,539 PATENT OFFICE.

WILHELK GBOENEBAUM, OF NEU-BAHE'LSBERG, NEAR BERLIN, GERMANY ASSIGNOR TO THE FIRM TELEGRAPHON AKTIENGESELLSGHAF'I, OF BERLIN, GERMANY.

TELEPHONICALLY-OPERATED RECORDING TALKING MACHINE.

Application filed ctober17, 1924. Serial No. '744, 169

To all whom it may 00mm..-

Be it known that I, WILHELM GROENE? BAUM, a citizen of Germany, residing at Neu-Babelsberg, near Berlin, Germany, have invented certain new and useful Improvements in Telephonically-0perated Re cording Talking Machines, of which the folchine by operation of a switch controlling the respective line, while at the same time the other lines are excluded from such connection. p

The accompanying drawing shows one embodiment of the invention, in which microphones belon in' to several stations can one at a time e rought into connection as desired with the telephonic recording device of a talking machine which may, for instance, be laced in a separate room. The drawing em ies a diagram of connections for such an installation. The drawing is divided into three parts by the lines I'-I and II--'II; the upper part contains the apparatus and accessories which constitute the recording station; the middle and lower parts show each the ap aratusand accessories at a station a an b respectively, of which stations there may be any desired number similarly equipped.

The instrument for receiving what is dietated into the microphone comprises a cylinder A driven b the motor B, for instance through a belt Therecorder D inscrlbes what is said upon the surface of the cylinder as it is moved along the cylinder by a threaded spindle E, driven through a pair I of gear wheels F. At the end of its movement towards the right'the recorder D abuts on one member of a contact U and breaks the contact. Associated with the talking machine are also. a relay G 'wlth contact sprin 1, 2, 3, 4; batteries K and K, an eng signal M and asu erviso signal N. %18 apparatus at eac spealiihg station includes a relay 0 with contact springs 1--8,

' an actuating switch P with contact springs If a person at station a, for instance, desires to dictate to the recorder, switch P is depressed. The following circuit (1) is then established: from positive of battery K conductor 1, contact springs 3,2 of P, conductor 7, and thence over the engaged signal M on the one hand and over the two engaged signals S on the other hand, to conductor 2 and tery K The si' the recor ing station, at the station which is dictating, and at all other speaking stations, that the recording station is busy.

Depression of the switch P at station a also brings contact springs" 4 and 5 into contact, so that the following circuit (2) is completed: from po'sitive of battery K con so tothe negative pole of batnals M and S therefore show at tact U, .conductor 4, switch Q, contact springs '5, 4 of P, contact springs 6, -5 of relay 0, conductor 3, winding of relay G to negative pole of K.

The relay G therefore responds and closes its contacts. Contacts 1, 2 of relay G complete the circuit of the motor B over the following path (3) from positive of K, through motor B, and contact springs 2, 1, tonegative of K.

The" contact of contact springs 3, 4 of relay G closes a circuit 4) for battery K; from positive. of K t rough recorder D, contact springs 4, 3, of relay G, conductor 5, microphone R, contact springs 4, 3' of relay O,a'nd conductor 6 to negative pole of K -When the microphone R at station a is spoken into, oscillating-currents are superimposed upon the current flowing through the circuit (4) and these actuate the recorder D which inscribes what is said cylinder A.

As above stated circuit (2) contains the switch Q of station a. When this switch is opened therefore, relay G ceases to be excited, and disconnects the motor B, at its contact 1, 2, consequently the motor stops. The micro hone circuit is interrupted at contact 3, 4 o? relay G, but the circuits which depend on the contact 2, 3 of switch P remain unchanged. Switch Q is intended to be opened during a pause in dictation, so as to economize-battery current, and also economize space on the recorder. 1

Circuit (2% above described has the following two ranches: (5),conductor 3, su-

upon the,

pervisory signal N, conductor 2 to negative of K (6) contact springs 6, 7, 8 of relay 0, supervisory relay '1', to negative of K.

The two supervisory relays N and '1 thus show that relay G has responded and that the end contact U is closed.

To prevent the dictation of station abeing interrupted by the second or any other station is the function in the first place of the engaged signals 8 which are rovided at all the stations and are connected in parallel between the conductors 7 and 2, so that they appear simultaneously. In addition depress on of switch Pat station a establishes the following branch (7) from circuit -(1) described above; conductor 7, contact springs 2, 1 of, all undepressed switches P at the second, third, and other stations, windings of the corresponding relays O, conductor 2 to negative pole of battery K The relays O of the second, hird, and other stations such as I) therefore attract their armatures. Contact between springs 1, 2 of a relay 0 bridges the contact springs 1, 3 of the corresponding switch P, so that the excitation of the relay 0 cannot be interrupted by depression of this switch. Also contact between sprin 3 and 4, 5 and 6, and 7 and 8, of relay is broken as the result of its excitation, so that the circuits (2), i) and (6) which as described above for station an include the corresponding contacts of the relay 0 of that station cannot be established.

In place of a microphone B designed only for dictation upon cylinder A, the several speaking stationsmay be equipped with a complete telephone apparatus for telephone conversations the microphone of the apparatus being connected in the manner described to the recorder D for recording the conversation. There may be azseparate line to each station for telephone conversations; but all the stations can also be joined to a common line through a line selector or through series connection.

What I claim is 1. A tele hone installation comprising a tele honica y operated recording talking mac ine, a plurality of speaking stations each including a microphone, an electric circuit operatively connecting the microphones to the recorder of said machine, and means at each station for causing its microphone to be connected to the talking ma chine recorder and for preventing any second micro hone from bein so connected.

2. A to efihone installation comprisin a tele honica y operated recording talk-mg mac inc, an electric motor for operating the'talkmg machine, anelectric circuit operatively connecting the motor and re corder of said machine to a source of power, a relay adapted on excitation to complete the circuit of said motor and the circuit for completing 'and its own microphone, and for interruptof the recorder of the talking machine, a plurality of speaking stations each includmg a microphone, means'establishing a circuit between the microphones and said recorder, a switch at each station adapted to close the circuit of said relay and means operated by said switch for interrupting the micro hone circuits of all other stations.

3. telephone installation comprising a telephonica y operated recording talking machine, a plurality of speaking stations each including a microphone, means including a 'pluralit of relays and a source of power for esta lishing an operative connection between the microphones and the recorder'of saidktalking machine a switch at each station, and means including said relays adapted to be operated by said switch the circuit of the recorder ingthe circuit of all other microphones.

4. A tele hone installation comprising a tele honicaly operated recording talking mac ine, a plurality of speaking stations each including a microphone, means connecting said microphone with the recorder of the talking machine, a motor for operating the talking machine, a switch at each station, an engaged si nal at each station, and means operated h y said switches for starting said motor and actuating all of said enga ed signals.

5. A te ephone installation comprising a tele honically operated recording talking mac ine,a plurality of speaking stations each including a microphone, means for con: necting said microphones with therecorder of the talking machine, a control circuit for said talking machine by the completion of which it is put in operation, a switch at each station ada ted to complete said control circuit, a loc -out relay at each station, a contact at each station included in said control circuit and o ened by the excitation ofsaid lock-out re ay, and a circuit for said lock-out relay adapted to be completed by the switch of any station except its own. a

6. Ina telephone installation the combination of a telephonicall operated recording talking machine, a p urality of speaking I stations each including a microphone, connections between said micro bones and the recorder of said talking machine, a motor for suit and thereby stop the motor and break the microphone circuit without afi'ecting said lock-out device. T

7 A tele hone installation comprising a tele honicaily operated recording talkmg mac inc, a motor for driving said talking machine, a relay adapted to close and open the circuits of therecorder and of said motor, a plurality of speaking stations cachincluding a microphone, a control circuit for said relay extending to each station, a switch at each station adapted to complete said control circuit, a lock-out relay at each station adapted to break the control circuit at that station, and a circuit for each said lockout relay including a' contact broken'by the actuation of the switch at the same station, a parallel contact completed by the excitation of the relay, and parallel contacts at other stations completed by actuation of the switches of said. stations;

8. In a telephone installation comprising a telephonicallyg operated recording talking machine. and a plurality of stations each ineluding a microphone adapted to be connected with the recorder of said talking machine, the combination with a switch at each station, of means actuated by each switch for setting said talking machine in operation, and for connecting said recorder in circuit with the microphone of that station, means at each station and adapted to be actuated by the switch of any other station for rendering its own switch inoperative, and additional means at each station for actuating said first-named means to stop the operation of said machineand to open the microphone recorder circuit.

9. A tele hone installation comprising a telephonicaily operated recording talklng machine, a plurality of speaking stations each including a micro hone, a control device adapted to set sai' talking machine in operation, and to connect said microphones in circuit with the recorder of said machine, acontrol circuit 'for said device extending to each station, a switch at each f station adapted to close said control circuit,

and a supervisory circuitin parallel with a part of said control circuit and adapted to be closed by said switch.

10. A tele hone installation comprising a tele honica y operated recording talking mac ine, a plurality of speaking stations each includin a micro hone, a control device adapted o set sai talking machine in operation for recording, a control circuit for said device extending to each station, a switch at each station adapted to close said control circuit, a supervisory circuit in parallel with a part of said control circuit and adapted to be closed by said switch, and a contact in said supervisory circuit ada ted to be broken by the recorder of said ta ing machine on reaching the end of its traverse.

11. A tele hone installation comprising a telephonical y operated recording talking machine, a plurality of speaking stations each including'a microphone, means for connecting all of said microphones in parallel with the recorder of said talking machine, and means at each speaking station for completing the circuit through the recorder and the microphone\ of that station, and for breaking the microphone circuit of every other station.

12. A telephone installation comprising a telephonically operated recording talking machine, a plurality of speaking stations each including a microphone, connections between said microphones and the recorder of said talking machine,.a lock-out relay at each station adapted'on excitation to interrupt the connections of its -microphone, a switch at each station, and an exciting circuit for said lock-out relay comprising a contact broken by the actuation of its own switch, a parallel contact completed by the excitation of the relay, and a plurality of contacts one at each station in arallel with each other and each adapted to e completed by the actuation of the switch of the respective station.

13. A telephone installation comprising a tele ,honically operated recording talking mac inc, a plurality of speaking stations each including a microphone, connections between said microphones and the recorder of said talking machine, a lock-outrelay at each station adapted on excitation to interrupt the connections of its microphone, a switch at each station, an exciting circuit for said lock-out relay comprising a contact broken by the actuation of its own switch, a parallel contact completed by the excitation of the relay, a plurality of contacts one at each station in parallel with each other and each adapted to be completed by the actuation of the switch of the respective station, and an engaged signal at each station bridged across said lock-out relay and the parallel contacts at the same station.

In testimony whereof I afiix my signature.

' WILHELM GROENEBAUM. 

